Light emitting substrate, print head, and image forming apparatus

Abstract

According to one embodiment, there is provided a light emitting substrate which includes a transparent substrate, a plurality of light emitting element groups, and a control unit. The plurality of light emitting element groups are formed by overlapping a first light emitting element and a second light emitting element on the transparent substrate. The control unit controls light emitting of the first light emitting element and the second light emitting element of the plurality of light emitting element groups. Amounts of light emitted from the plurality of light emitting element groups are uniform.

What is claimed is: 
     
       1. A light emitting substrate comprising:
 a transparent substrate; 
 a plurality of light emitting element groups which are formed by a first light emitting element on the transparent substrate and a second light emitting element over the first light emitting element; and 
 a control unit that controls light emitting of the first light emitting element and the second light emitting element of the plurality of light emitting element groups, 
 wherein amounts of light emitted from the plurality of light emitting element groups are uniform. 
 
     
     
       2. The substrate according to  claim 1 ,
 wherein, in the control, the first light emitting element and the second light emitting element of the light emitting element group are individually controlled. 
 
     
     
       3. The substrate according to  claim 1 ,
 wherein the first light emitting element and the second light emitting element of the light emitting element group are organic EL. 
 
     
     
       4. A print head comprising:
 a transparent substrate; 
 a plurality of light emitting element groups which are formed as a first light emitting element on the transparent substrate and a second light emitting element over the first light emitting element; 
 a lens that condenses superimposed light from the first light emitting element and the second light emitting element of each light emitting element group; and 
 a control unit that controls an amount of emitted light of the first light emitting element and the second light emitting element of the plurality of light emitting element groups, 
 wherein the amounts of light from the plurality of light emitting element groups passing through the lens are uniform. 
 
     
     
       5. The head according to  claim 4 ,
 wherein, in the control, the amounts of light of the first light emitting element and the second light emitting element of the light emitting element group are individually controlled. 
 
     
     
       6. The head according to  claim 4 ,
 wherein the first light emitting element and the second light emitting element of the light emitting element group are organic EL. 
 
     
     
       7. The head according to  claim 4 ,
 wherein the control unit includes a memory for controlling the amount of light in order to control the amount of light of the first light emitting element or the second light emitting element of the light emitting element group. 
 
     
     
       8. An image forming apparatus comprising:
 the print head according to any one of  claims 4  to  7 ; 
 a photoconductive body; 
 a charger that charges the photoconductive body; and 
 a developer that develops a latent image on the photoconductive body, 
 wherein the print head irradiates the photoconductive body with light, exposes the photoconductive body charged by the charger, and forms the latent image on the photoconductive body.